45129731 has 4 divisors (see below), whose sum is σ = 47505000. Its totient is φ = 42754464.

The previous prime is 45129719. The next prime is 45129737. The reversal of 45129731 is 13792154.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-45129731 is a prime.

It is a super-2 number, since 2×45129731² = 4073385240264722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (45129737) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1187606 + ... + 1187643.

It is an arithmetic number, because the mean of its divisors is an integer number (11876250).

Almost surely, 2^45129731 is an apocalyptic number.

45129731 is a deficient number, since it is larger than the sum of its proper divisors (2375269).

45129731 is a wasteful number, since it uses less digits than its factorization.

45129731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2375268.

The product of its digits is 7560, while the sum is 32.

The square root of 45129731 is about 6717.8665512200. The cubic root of 45129731 is about 356.0308094154.

The spelling of 45129731 in words is "forty-five million, one hundred twenty-nine thousand, seven hundred thirty-one".