61490409437 has 2 divisors, whose sum is σ = 61490409438. Its totient is φ = 61490409436.

The previous prime is 61490409433. The next prime is 61490409443. The reversal of 61490409437 is 73490409416.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 32162476921 + 29327932516 = 179339^2 + 171254^2 .

It is a cyclic number.

It is not a de Polignac number, because 61490409437 - 2² = 61490409433 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 61490409391 and 61490409400.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61490409433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30745204718 + 30745204719.

It is an arithmetic number, because the mean of its divisors is an integer number (30745204719).

Almost surely, 2^61490409437 is an apocalyptic number.

It is an amenable number.

61490409437 is a deficient number, since it is larger than the sum of its proper divisors (1).

61490409437 is an equidigital number, since it uses as much as digits as its factorization.

61490409437 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 653184, while the sum is 47.

The spelling of 61490409437 in words is "sixty-one billion, four hundred ninety million, four hundred nine thousand, four hundred thirty-seven".