40697551 has 4 divisors (see below), whose sum is σ = 41387400. Its totient is φ = 40007704.

The previous prime is 40697549. The next prime is 40697567. The reversal of 40697551 is 15579604.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 40697551 - 2¹ = 40697549 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 40697551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40697851) 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, 344836 + ... + 344953.

It is an arithmetic number, because the mean of its divisors is an integer number (10346850).

Almost surely, 2^40697551 is an apocalyptic number.

40697551 is a deficient number, since it is larger than the sum of its proper divisors (689849).

40697551 is an equidigital number, since it uses as much as digits as its factorization.

40697551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 689848.

The product of its (nonzero) digits is 37800, while the sum is 37.

The square root of 40697551 is about 6379.4632219333. The cubic root of 40697551 is about 343.9717363429.

The spelling of 40697551 in words is "forty million, six hundred ninety-seven thousand, five hundred fifty-one".