46991781 has 24 divisors (see below), whose sum is σ = 69922944. Its totient is φ = 30392640.

The previous prime is 46991771. The next prime is 46991797. The reversal of 46991781 is 18719964.

It is a happy number.

It is not a de Polignac number, because 46991781 - 2⁶ = 46991717 is a prime.

It is a super-2 number, since 2×46991781² = 4416454963103922, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (46991701) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 127860 + ... + 128226.

It is an arithmetic number, because the mean of its divisors is an integer number (2913456).

Almost surely, 2^46991781 is an apocalyptic number.

46991781 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

46991781 is a deficient number, since it is larger than the sum of its proper divisors (22931163).

46991781 is a wasteful number, since it uses less digits than its factorization.

46991781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 761 (or 758 counting only the distinct ones).

The product of its digits is 108864, while the sum is 45.

The square root of 46991781 is about 6855.0551420102. The cubic root of 46991781 is about 360.8615706588.

The spelling of 46991781 in words is "forty-six million, nine hundred ninety-one thousand, seven hundred eighty-one".