90154919 has 2 divisors, whose sum is σ = 90154920. Its totient is φ = 90154918.

The previous prime is 90154907. The next prime is 90154949. The reversal of 90154919 is 91945109.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 90154919 - 2¹⁶ = 90089383 is a prime.

It is a super-2 number, since 2×90154919² = 16255818839793122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90154949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45077459 + 45077460.

It is an arithmetic number, because the mean of its divisors is an integer number (45077460).

Almost surely, 2^90154919 is an apocalyptic number.

90154919 is a deficient number, since it is larger than the sum of its proper divisors (1).

90154919 is an equidigital number, since it uses as much as digits as its factorization.

90154919 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14580, while the sum is 38.

The square root of 90154919 is about 9494.9944181132. The cubic root of 90154919 is about 448.3974586472.

The spelling of 90154919 in words is "ninety million, one hundred fifty-four thousand, nine hundred nineteen".