31001145 has 32 divisors (see below), whose sum is σ = 58648320. Its totient is φ = 13681920.

The previous prime is 31001143. The next prime is 31001161. The reversal of 31001145 is 54110013.

It is not a de Polignac number, because 31001145 - 2¹ = 31001143 is a prime.

It is a super-2 number, since 2×31001145² = 1922141982622050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is not an unprimeable number, because it can be changed into a prime (31001143) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2046 + ... + 8135.

It is an arithmetic number, because the mean of its divisors is an integer number (1832760).

Almost surely, 2^31001145 is an apocalyptic number.

31001145 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

31001145 is a deficient number, since it is larger than the sum of its proper divisors (27647175).

31001145 is a wasteful number, since it uses less digits than its factorization.

31001145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10225.

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 31001145 is about 5567.8671859160. The cubic root of 31001145 is about 314.1419328053.

Adding to 31001145 its reverse (54110013), we get a palindrome (85111158).

The spelling of 31001145 in words is "thirty-one million, one thousand, one hundred forty-five".