61247491 has 2 divisors, whose sum is σ = 61247492. Its totient is φ = 61247490.

The previous prime is 61247479. The next prime is 61247509. The reversal of 61247491 is 19474216.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61247491 - 2²⁵ = 27693059 is a prime.

It is not a weakly prime, because it can be changed into another prime (61247411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30623745 + 30623746.

It is an arithmetic number, because the mean of its divisors is an integer number (30623746).

Almost surely, 2^61247491 is an apocalyptic number.

61247491 is a deficient number, since it is larger than the sum of its proper divisors (1).

61247491 is an equidigital number, since it uses as much as digits as its factorization.

61247491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12096, while the sum is 34.

The square root of 61247491 is about 7826.0776254775. The cubic root of 61247491 is about 394.1813756895.

The spelling of 61247491 in words is "sixty-one million, two hundred forty-seven thousand, four hundred ninety-one".