137303731 has 4 divisors (see below), whose sum is σ = 137583864. Its totient is φ = 137023600.

The previous prime is 137303723. The next prime is 137303737.

137303731 is nontrivially palindromic in base 10.

137303731 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 137303731 - 2³ = 137303723 is a prime.

It is a super-2 number, since 2×137303731² = 37704629093040722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 137303731.

It is not an unprimeable number, because it can be changed into a prime (137303737) 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, 139330 + ... + 140311.

It is an arithmetic number, because the mean of its divisors is an integer number (34395966).

Almost surely, 2^137303731 is an apocalyptic number.

137303731 is a deficient number, since it is larger than the sum of its proper divisors (280133).

137303731 is an equidigital number, since it uses as much as digits as its factorization.

137303731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280132.

The product of its (nonzero) digits is 3969, while the sum is 28.

The square root of 137303731 is about 11717.6674726671. The cubic root of 137303731 is about 515.8943594706.

The spelling of 137303731 in words is "one hundred thirty-seven million, three hundred three thousand, seven hundred thirty-one".