61672491 has 6 divisors (see below), whose sum is σ = 89082500. Its totient is φ = 41114988.

The previous prime is 61672489. The next prime is 61672543. The reversal of 61672491 is 19427616.

61672491 is a `hidden beast` number, since 6 + 167 + 2 + 491 = 666.

61672491 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 61672491 - 2¹ = 61672489 is a prime.

It is a super-2 number, since 2×61672491² = 7606992292290162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61672411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3426241 + ... + 3426258.

Almost surely, 2^61672491 is an apocalyptic number.

61672491 is a deficient number, since it is larger than the sum of its proper divisors (27410009).

61672491 is a wasteful number, since it uses less digits than its factorization.

61672491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6852505 (or 6852502 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 61672491 is about 7853.1834946090. The cubic root of 61672491 is about 395.0910242611.

The spelling of 61672491 in words is "sixty-one million, six hundred seventy-two thousand, four hundred ninety-one".