1901268157 has 2 divisors, whose sum is σ = 1901268158. Its totient is φ = 1901268156.

The previous prime is 1901268139. The next prime is 1901268169. The reversal of 1901268157 is 7518621091.

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., 1894947961 + 6320196 = 43531^2 + 2514^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1901268157 is a prime.

It is a super-2 number, since 2×1901268157² = 7229641209644353298, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1901208157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 950634078 + 950634079.

It is an arithmetic number, because the mean of its divisors is an integer number (950634079).

Almost surely, 2^1901268157 is an apocalyptic number.

It is an amenable number.

1901268157 is a deficient number, since it is larger than the sum of its proper divisors (1).

1901268157 is an equidigital number, since it uses as much as digits as its factorization.

1901268157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30240, while the sum is 40.

The square root of 1901268157 is about 43603.5337673450. The cubic root of 1901268157 is about 1238.8378282555.

The spelling of 1901268157 in words is "one billion, nine hundred one million, two hundred sixty-eight thousand, one hundred fifty-seven".