75117631 has 4 divisors (see below), whose sum is σ = 75162952. Its totient is φ = 75072312.

The previous prime is 75117613. The next prime is 75117641. The reversal of 75117631 is 13671157.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13671157 = 3539 ⋅3863.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-75117631 is a prime.

It is a super-2 number, since 2×75117631² = 11285316974104322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 75117593 and 75117602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75117641) 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, 20076 + ... + 23521.

It is an arithmetic number, because the mean of its divisors is an integer number (18790738).

Almost surely, 2^75117631 is an apocalyptic number.

75117631 is a deficient number, since it is larger than the sum of its proper divisors (45321).

75117631 is a wasteful number, since it uses less digits than its factorization.

75117631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45320.

The product of its digits is 4410, while the sum is 31.

The square root of 75117631 is about 8667.0428059402. The cubic root of 75117631 is about 421.9366926588.

Adding to 75117631 its reverse (13671157), we get a palindrome (88788788).

The spelling of 75117631 in words is "seventy-five million, one hundred seventeen thousand, six hundred thirty-one".