4721947731 has 20 divisors (see below), whose sum is σ = 7203859872. Its totient is φ = 3080984688.

The previous prime is 4721947717. The next prime is 4721947751. The reversal of 4721947731 is 1377491274.

It is not a de Polignac number, because 4721947731 - 2²² = 4717753427 is a prime.

It is a super-2 number, since 2×4721947731² = 44593580748592096722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (4721947751) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 616360 + ... + 623973.

Almost surely, 2^4721947731 is an apocalyptic number.

4721947731 is a deficient number, since it is larger than the sum of its proper divisors (2481912141).

4721947731 is a wasteful number, since it uses less digits than its factorization.

4721947731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1240392 (or 1240383 counting only the distinct ones).

The product of its digits is 296352, while the sum is 45.

The square root of 4721947731 is about 68716.4298475990. The cubic root of 4721947731 is about 1677.6720083510.

The spelling of 4721947731 in words is "four billion, seven hundred twenty-one million, nine hundred forty-seven thousand, seven hundred thirty-one".