90197951 has 2 divisors, whose sum is σ = 90197952. Its totient is φ = 90197950.

The previous prime is 90197929. The next prime is 90197953. The reversal of 90197951 is 15979109.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90197951 is a prime.

Together with 90197953, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 90197899 and 90197908.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90197953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45098975 + 45098976.

It is an arithmetic number, because the mean of its divisors is an integer number (45098976).

Almost surely, 2^90197951 is an apocalyptic number.

90197951 is a deficient number, since it is larger than the sum of its proper divisors (1).

90197951 is an equidigital number, since it uses as much as digits as its factorization.

90197951 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25515, while the sum is 41.

The square root of 90197951 is about 9497.2601838636. The cubic root of 90197951 is about 448.4687890878.

The spelling of 90197951 in words is "ninety million, one hundred ninety-seven thousand, nine hundred fifty-one".