62551981 has 2 divisors, whose sum is σ = 62551982. Its totient is φ = 62551980.

The previous prime is 62551969. The next prime is 62551987. The reversal of 62551981 is 18915526.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36796356 + 25755625 = 6066^2 + 5075^2 .

It is a cyclic number.

It is not a de Polignac number, because 62551981 - 2¹⁵ = 62519213 is a prime.

It is a super-2 number, since 2×62551981² = 7825500654048722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 62551981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (62551987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31275990 + 31275991.

It is an arithmetic number, because the mean of its divisors is an integer number (31275991).

Almost surely, 2^62551981 is an apocalyptic number.

It is an amenable number.

62551981 is a deficient number, since it is larger than the sum of its proper divisors (1).

62551981 is an equidigital number, since it uses as much as digits as its factorization.

62551981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21600, while the sum is 37.

The square root of 62551981 is about 7908.9810342420. The cubic root of 62551981 is about 396.9602520973.

The spelling of 62551981 in words is "sixty-two million, five hundred fifty-one thousand, nine hundred eighty-one".