45501991 has 2 divisors, whose sum is σ = 45501992. Its totient is φ = 45501990.

The previous prime is 45501977. The next prime is 45502003. The reversal of 45501991 is 19910554.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 45501991 - 2²¹ = 43404839 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (45501901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22750995 + 22750996.

It is an arithmetic number, because the mean of its divisors is an integer number (22750996).

Almost surely, 2^45501991 is an apocalyptic number.

45501991 is a deficient number, since it is larger than the sum of its proper divisors (1).

45501991 is an equidigital number, since it uses as much as digits as its factorization.

45501991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8100, while the sum is 34.

The square root of 45501991 is about 6745.5163627405. The cubic root of 45501991 is about 357.0070562779.

The spelling of 45501991 in words is "forty-five million, five hundred one thousand, nine hundred ninety-one".