40691553 has 32 divisors (see below), whose sum is σ = 64838400. Its totient is φ = 22208256.

The previous prime is 40691549. The next prime is 40691569. The reversal of 40691553 is 35519604.

It is a happy number.

It is not a de Polignac number, because 40691553 - 2² = 40691549 is a prime.

It is not an unprimeable number, because it can be changed into a prime (40691543) 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, 66075 + ... + 66687.

It is an arithmetic number, because the mean of its divisors is an integer number (2026200).

Almost surely, 2^40691553 is an apocalyptic number.

It is an amenable number.

40691553 is a deficient number, since it is larger than the sum of its proper divisors (24146847).

40691553 is a wasteful number, since it uses less digits than its factorization.

40691553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 761.

The product of its (nonzero) digits is 16200, while the sum is 33.

The square root of 40691553 is about 6378.9931023634. The cubic root of 40691553 is about 343.9548373421.

The spelling of 40691553 in words is "forty million, six hundred ninety-one thousand, five hundred fifty-three".