91902143 has 2 divisors, whose sum is σ = 91902144. Its totient is φ = 91902142.

The previous prime is 91902103. The next prime is 91902149. The reversal of 91902143 is 34120919.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91902143 - 2⁶ = 91902079 is a prime.

It is equal to p_5320865 and since 91902143 and 5320865 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91902149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45951071 + 45951072.

It is an arithmetic number, because the mean of its divisors is an integer number (45951072).

Almost surely, 2^91902143 is an apocalyptic number.

91902143 is a deficient number, since it is larger than the sum of its proper divisors (1).

91902143 is an equidigital number, since it uses as much as digits as its factorization.

91902143 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 91902143 is about 9586.5605406736. The cubic root of 91902143 is about 451.2756282588.

The spelling of 91902143 in words is "ninety-one million, nine hundred two thousand, one hundred forty-three".