91420451 has 12 divisors (see below), whose sum is σ = 96205032. Its totient is φ = 86825088.

The previous prime is 91420409. The next prime is 91420471. The reversal of 91420451 is 15402419.

It is not a de Polignac number, because 91420451 - 2¹⁴ = 91404067 is a prime.

It is a super-2 number, since 2×91420451² = 16715397722086802, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 91420451.

It is not an unprimeable number, because it can be changed into a prime (91420471) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 58091 + ... + 59643.

It is an arithmetic number, because the mean of its divisors is an integer number (8017086).

Almost surely, 2^91420451 is an apocalyptic number.

91420451 is a deficient number, since it is larger than the sum of its proper divisors (4784581).

91420451 is a wasteful number, since it uses less digits than its factorization.

91420451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1670 (or 1633 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 91420451 is about 9561.4042378722. The cubic root of 91420451 is about 450.4858144267.

The spelling of 91420451 in words is "ninety-one million, four hundred twenty thousand, four hundred fifty-one".