61216637 has 2 divisors, whose sum is σ = 61216638. Its totient is φ = 61216636.

The previous prime is 61216633. The next prime is 61216657. The reversal of 61216637 is 73661216.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52041796 + 9174841 = 7214^2 + 3029^2 .

It is a cyclic number.

It is not a de Polignac number, because 61216637 - 2² = 61216633 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61216633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30608318 + 30608319.

It is an arithmetic number, because the mean of its divisors is an integer number (30608319).

Almost surely, 2^61216637 is an apocalyptic number.

It is an amenable number.

61216637 is a deficient number, since it is larger than the sum of its proper divisors (1).

61216637 is an equidigital number, since it uses as much as digits as its factorization.

61216637 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9072, while the sum is 32.

The square root of 61216637 is about 7824.1061470305. The cubic root of 61216637 is about 394.1151737124.

The spelling of 61216637 in words is "sixty-one million, two hundred sixteen thousand, six hundred thirty-seven".