40135551 has 4 divisors (see below), whose sum is σ = 53514072. Its totient is φ = 26757032.

The previous prime is 40135549. The next prime is 40135573. The reversal of 40135551 is 15553104.

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 40135551 - 2¹ = 40135549 is a prime.

It is a super-2 number, since 2×40135551² = 3221724908147202, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40135451) 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, 6689256 + ... + 6689261.

It is an arithmetic number, because the mean of its divisors is an integer number (13378518).

Almost surely, 2^40135551 is an apocalyptic number.

40135551 is a deficient number, since it is larger than the sum of its proper divisors (13378521).

40135551 is a wasteful number, since it uses less digits than its factorization.

40135551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13378520.

The product of its (nonzero) digits is 1500, while the sum is 24.

The square root of 40135551 is about 6335.2625044271. The cubic root of 40135551 is about 342.3810686928.

Adding to 40135551 its reverse (15553104), we get a palindrome (55688655).

The spelling of 40135551 in words is "forty million, one hundred thirty-five thousand, five hundred fifty-one".