30521131 has 2 divisors, whose sum is σ = 30521132. Its totient is φ = 30521130.

The previous prime is 30521119. The next prime is 30521149. The reversal of 30521131 is 13112503.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 30521131 - 2²¹ = 28423979 is a prime.

It is a super-2 number, since 2×30521131² = 1863078875038322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (30521531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15260565 + 15260566.

It is an arithmetic number, because the mean of its divisors is an integer number (15260566).

Almost surely, 2^30521131 is an apocalyptic number.

30521131 is a deficient number, since it is larger than the sum of its proper divisors (1).

30521131 is an equidigital number, since it uses as much as digits as its factorization.

30521131 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 90, while the sum is 16.

The square root of 30521131 is about 5524.5932881978. The cubic root of 30521131 is about 312.5121266761.

Adding to 30521131 its reverse (13112503), we get a palindrome (43633634).

The spelling of 30521131 in words is "thirty million, five hundred twenty-one thousand, one hundred thirty-one".