61651237 has 2 divisors, whose sum is σ = 61651238. Its totient is φ = 61651236.

The previous prime is 61651211. The next prime is 61651259. The reversal of 61651237 is 73215616.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41139396 + 20511841 = 6414^2 + 4529^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61651237 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 61651199 and 61651208.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61681237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30825618 + 30825619.

It is an arithmetic number, because the mean of its divisors is an integer number (30825619).

Almost surely, 2^61651237 is an apocalyptic number.

It is an amenable number.

61651237 is a deficient number, since it is larger than the sum of its proper divisors (1).

61651237 is an equidigital number, since it uses as much as digits as its factorization.

61651237 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7560, while the sum is 31.

The square root of 61651237 is about 7851.8301688205. The cubic root of 61651237 is about 395.0456327134.

The spelling of 61651237 in words is "sixty-one million, six hundred fifty-one thousand, two hundred thirty-seven".