81962537 has 2 divisors, whose sum is σ = 81962538. Its totient is φ = 81962536.

The previous prime is 81962533. The next prime is 81962549. The reversal of 81962537 is 73526918.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70375321 + 11587216 = 8389^2 + 3404^2 .

It is a cyclic number.

It is not a de Polignac number, because 81962537 - 2² = 81962533 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 81962494 and 81962503.

It is not a weakly prime, because it can be changed into another prime (81962533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40981268 + 40981269.

It is an arithmetic number, because the mean of its divisors is an integer number (40981269).

Almost surely, 2^81962537 is an apocalyptic number.

It is an amenable number.

81962537 is a deficient number, since it is larger than the sum of its proper divisors (1).

81962537 is an equidigital number, since it uses as much as digits as its factorization.

81962537 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90720, while the sum is 41.

The square root of 81962537 is about 9053.3163536905. The cubic root of 81962537 is about 434.3819769906.

The spelling of 81962537 in words is "eighty-one million, nine hundred sixty-two thousand, five hundred thirty-seven".