61368431 has 4 divisors (see below), whose sum is σ = 62865264. Its totient is φ = 59871600.

The previous prime is 61368427. The next prime is 61368443. The reversal of 61368431 is 13486316.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61368431 - 2² = 61368427 is a prime.

It is a super-2 number, since 2×61368431² = 7532168646803522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61308431) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 748355 + ... + 748436.

It is an arithmetic number, because the mean of its divisors is an integer number (15716316).

Almost surely, 2^61368431 is an apocalyptic number.

61368431 is a deficient number, since it is larger than the sum of its proper divisors (1496833).

61368431 is a wasteful number, since it uses less digits than its factorization.

61368431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1496832.

The product of its digits is 10368, while the sum is 32.

The square root of 61368431 is about 7833.8005463504. The cubic root of 61368431 is about 394.4406567969.

The spelling of 61368431 in words is "sixty-one million, three hundred sixty-eight thousand, four hundred thirty-one".