36861431 has 4 divisors (see below), whose sum is σ = 36921792. Its totient is φ = 36801072.

The previous prime is 36861427. The next prime is 36861439. The reversal of 36861431 is 13416863.

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 36861431 - 2² = 36861427 is a prime.

It is a super-2 number, since 2×36861431² = 2717530190735522, 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 (36861439) 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, 29255 + ... + 30488.

It is an arithmetic number, because the mean of its divisors is an integer number (9230448).

Almost surely, 2^36861431 is an apocalyptic number.

36861431 is a deficient number, since it is larger than the sum of its proper divisors (60361).

36861431 is an equidigital number, since it uses as much as digits as its factorization.

36861431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60360.

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

The square root of 36861431 is about 6071.3615441678. The cubic root of 36861431 is about 332.8056804101.

The spelling of 36861431 in words is "thirty-six million, eight hundred sixty-one thousand, four hundred thirty-one".