31145077 has 4 divisors (see below), whose sum is σ = 31292896. Its totient is φ = 30997260.

The previous prime is 31145069. The next prime is 31145113. The reversal of 31145077 is 77054113.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 77054113 = 523 ⋅147331.

It is a cyclic number.

It is not a de Polignac number, because 31145077 - 2³ = 31145069 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31145027) 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, 73593 + ... + 74014.

It is an arithmetic number, because the mean of its divisors is an integer number (7823224).

Almost surely, 2^31145077 is an apocalyptic number.

It is an amenable number.

31145077 is a deficient number, since it is larger than the sum of its proper divisors (147819).

31145077 is a wasteful number, since it uses less digits than its factorization.

31145077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147818.

The product of its (nonzero) digits is 2940, while the sum is 28.

The square root of 31145077 is about 5580.7774547996. Note that the first 3 decimals coincide. The cubic root of 31145077 is about 314.6273480140.

The spelling of 31145077 in words is "thirty-one million, one hundred forty-five thousand, seventy-seven".