45391891 has 2 divisors, whose sum is σ = 45391892. Its totient is φ = 45391890.

The previous prime is 45391877. The next prime is 45391901. The reversal of 45391891 is 19819354.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 45391891 - 2¹³ = 45383699 is a prime.

It is a super-3 number, since 3×45391891³ (a number of 24 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (45391391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22695945 + 22695946.

It is an arithmetic number, because the mean of its divisors is an integer number (22695946).

Almost surely, 2^45391891 is an apocalyptic number.

45391891 is a deficient number, since it is larger than the sum of its proper divisors (1).

45391891 is an equidigital number, since it uses as much as digits as its factorization.

45391891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 38880, while the sum is 40.

The square root of 45391891 is about 6737.3504436091. The cubic root of 45391891 is about 356.7188767816.

The spelling of 45391891 in words is "forty-five million, three hundred ninety-one thousand, eight hundred ninety-one".