31380955 has 16 divisors (see below), whose sum is σ = 38525760. Its totient is φ = 24532992.

The previous prime is 31380953. The next prime is 31380961. The reversal of 31380955 is 55908313.

It is a 11-Lehmer number, since φ(31380955) divides (31380955-1)¹¹.

It is a cyclic number.

It is not a de Polignac number, because 31380955 - 2¹ = 31380953 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31380955.

It is not an unprimeable number, because it can be changed into a prime (31380953) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42802 + ... + 43528.

It is an arithmetic number, because the mean of its divisors is an integer number (2407860).

Almost surely, 2^31380955 is an apocalyptic number.

31380955 is a deficient number, since it is larger than the sum of its proper divisors (7144805).

31380955 is an equidigital number, since it uses as much as digits as its factorization.

31380955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 918.

The product of its (nonzero) digits is 16200, while the sum is 34.

The square root of 31380955 is about 5601.8706696960. The cubic root of 31380955 is about 315.4196305409.

The spelling of 31380955 in words is "thirty-one million, three hundred eighty thousand, nine hundred fifty-five".