151312261 has 2 divisors, whose sum is σ = 151312262. Its totient is φ = 151312260.

The previous prime is 151312247. The next prime is 151312267. The reversal of 151312261 is 162213151.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 115240225 + 36072036 = 10735^2 + 6006^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-151312261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (151312267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 75656130 + 75656131.

It is an arithmetic number, because the mean of its divisors is an integer number (75656131).

Almost surely, 2^151312261 is an apocalyptic number.

It is an amenable number.

151312261 is a deficient number, since it is larger than the sum of its proper divisors (1).

151312261 is an equidigital number, since it uses as much as digits as its factorization.

151312261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 360, while the sum is 22.

The square root of 151312261 is about 12300.9048854139. The cubic root of 151312261 is about 532.8742163000.

The spelling of 151312261 in words is "one hundred fifty-one million, three hundred twelve thousand, two hundred sixty-one".