61992591 has 32 divisors (see below), whose sum is σ = 91404288. Its totient is φ = 37201920.

The previous prime is 61992589. The next prime is 61992631. The reversal of 61992591 is 19529916.

61992591 = T₁₆₄ + T₁₆₅ + ... + T₇₂₁.

It is a happy number.

It is not a de Polignac number, because 61992591 - 2¹ = 61992589 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61992191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 178480 + ... + 178826.

It is an arithmetic number, because the mean of its divisors is an integer number (2856384).

Almost surely, 2^61992591 is an apocalyptic number.

61992591 is a deficient number, since it is larger than the sum of its proper divisors (29411697).

61992591 is a wasteful number, since it uses less digits than its factorization.

61992591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 511.

The product of its digits is 43740, while the sum is 42.

The square root of 61992591 is about 7873.5373879851. The cubic root of 61992591 is about 395.7733947384.

The spelling of 61992591 in words is "sixty-one million, nine hundred ninety-two thousand, five hundred ninety-one".