91401551 has 2 divisors, whose sum is σ = 91401552. Its totient is φ = 91401550.

The previous prime is 91401529. The next prime is 91401559. The reversal of 91401551 is 15510419.

It is a strong prime.

It is an emirp because it is prime and its reverse (15510419) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91401551 - 2¹⁸ = 91139407 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 91401551.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91401559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45700775 + 45700776.

It is an arithmetic number, because the mean of its divisors is an integer number (45700776).

Almost surely, 2^91401551 is an apocalyptic number.

91401551 is a deficient number, since it is larger than the sum of its proper divisors (1).

91401551 is an equidigital number, since it uses as much as digits as its factorization.

91401551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 900, while the sum is 26.

The square root of 91401551 is about 9560.4158382363. The cubic root of 91401551 is about 450.4547682417.

The spelling of 91401551 in words is "ninety-one million, four hundred one thousand, five hundred fifty-one".