55377731 has 4 divisors (see below), whose sum is σ = 55528992. Its totient is φ = 55226472.

The previous prime is 55377709. The next prime is 55377737. The reversal of 55377731 is 13777355.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13777355 = 5 ⋅2755471.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55377731 is a prime.

It is a super-2 number, since 2×55377731² = 6133386181416722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55377737) 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, 75080 + ... + 75813.

It is an arithmetic number, because the mean of its divisors is an integer number (13882248).

Almost surely, 2^55377731 is an apocalyptic number.

55377731 is a deficient number, since it is larger than the sum of its proper divisors (151261).

55377731 is a wasteful number, since it uses less digits than its factorization.

55377731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151260.

The product of its digits is 77175, while the sum is 38.

The square root of 55377731 is about 7441.6215302849. The cubic root of 55377731 is about 381.1638624356.

The spelling of 55377731 in words is "fifty-five million, three hundred seventy-seven thousand, seven hundred thirty-one".