90641551 has 64 divisors (see below), whose sum is σ = 132120576. Its totient is φ = 59875200.

The previous prime is 90641543. The next prime is 90641557. The reversal of 90641551 is 15514609.

It is not a de Polignac number, because 90641551 - 2³ = 90641543 is a prime.

It is a super-4 number, since 4×90641551⁴ (a number of 33 digits) contains 4444 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90641557) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 713650 + ... + 713776.

It is an arithmetic number, because the mean of its divisors is an integer number (2064384).

Almost surely, 2^90641551 is an apocalyptic number.

90641551 is a gapful number since it is divisible by the number (91) formed by its first and last digit.

90641551 is a deficient number, since it is larger than the sum of its proper divisors (41479025).

90641551 is a wasteful number, since it uses less digits than its factorization.

90641551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212.

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 90641551 is about 9520.5856437511. The cubic root of 90641551 is about 449.2027876832.

The spelling of 90641551 in words is "ninety million, six hundred forty-one thousand, five hundred fifty-one".