61562991 has 16 divisors (see below), whose sum is σ = 94867200. Its totient is φ = 34782528.

The previous prime is 61562989. The next prime is 61562999. The reversal of 61562991 is 19926516.

It is not a de Polignac number, because 61562991 - 2¹ = 61562989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61562999) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14601 + ... + 18338.

It is an arithmetic number, because the mean of its divisors is an integer number (5929200).

Almost surely, 2^61562991 is an apocalyptic number.

61562991 is a deficient number, since it is larger than the sum of its proper divisors (33304209).

61562991 is a wasteful number, since it uses less digits than its factorization.

61562991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33038.

The product of its digits is 29160, while the sum is 39.

The square root of 61562991 is about 7846.2087022969. The cubic root of 61562991 is about 394.8570566470.

The spelling of 61562991 in words is "sixty-one million, five hundred sixty-two thousand, nine hundred ninety-one".