1537491731 has 2 divisors, whose sum is σ = 1537491732. Its totient is φ = 1537491730.

The previous prime is 1537491721. The next prime is 1537491733. The reversal of 1537491731 is 1371947351.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1537491731 - 2²⁶ = 1470382867 is a prime.

It is a super-2 number, since 2×1537491731² = 4727761645786752722, which contains 22 as substring.

Together with 1537491733, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1537491733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 768745865 + 768745866.

It is an arithmetic number, because the mean of its divisors is an integer number (768745866).

Almost surely, 2^1537491731 is an apocalyptic number.

1537491731 is a deficient number, since it is larger than the sum of its proper divisors (1).

1537491731 is an equidigital number, since it uses as much as digits as its factorization.

1537491731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 79380, while the sum is 41.

The square root of 1537491731 is about 39210.8624108167. The cubic root of 1537491731 is about 1154.1730507405.

The spelling of 1537491731 in words is "one billion, five hundred thirty-seven million, four hundred ninety-one thousand, seven hundred thirty-one".