902449661 has 2 divisors, whose sum is σ = 902449662. Its totient is φ = 902449660.

The previous prime is 902449619. The next prime is 902449687. The reversal of 902449661 is 166944209.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 480968761 + 421480900 = 21931^2 + 20530^2 .

It is an emirp because it is prime and its reverse (166944209) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 902449661 - 2¹⁴ = 902433277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (902449601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 451224830 + 451224831.

It is an arithmetic number, because the mean of its divisors is an integer number (451224831).

Almost surely, 2^902449661 is an apocalyptic number.

It is an amenable number.

902449661 is a deficient number, since it is larger than the sum of its proper divisors (1).

902449661 is an equidigital number, since it uses as much as digits as its factorization.

902449661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 93312, while the sum is 41.

The square root of 902449661 is about 30040.7999394157. The cubic root of 902449661 is about 966.3645620494.

It can be divided in two parts, 9024 and 49661, that added together give a palindrome (58685).

The spelling of 902449661 in words is "nine hundred two million, four hundred forty-nine thousand, six hundred sixty-one".