40531513 has 4 divisors (see below), whose sum is σ = 44216208. Its totient is φ = 36846820.

The previous prime is 40531489. The next prime is 40531523. The reversal of 40531513 is 31513504.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 40531513 - 2⁵ = 40531481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40531523) 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, 1842331 + ... + 1842352.

It is an arithmetic number, because the mean of its divisors is an integer number (11054052).

Almost surely, 2^40531513 is an apocalyptic number.

It is an amenable number.

40531513 is a deficient number, since it is larger than the sum of its proper divisors (3684695).

40531513 is a wasteful number, since it uses less digits than its factorization.

40531513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3684694.

The product of its (nonzero) digits is 900, while the sum is 22.

The square root of 40531513 is about 6366.4364443541. The cubic root of 40531513 is about 343.5033197481.

Subtracting from 40531513 its reverse (31513504), we obtain a square (9018009 = 3003²).

The spelling of 40531513 in words is "forty million, five hundred thirty-one thousand, five hundred thirteen".