1051320731 has 16 divisors (see below), whose sum is σ = 1137672000. Its totient is φ = 968529408.

The previous prime is 1051320713. The next prime is 1051320737. The reversal of 1051320731 is 1370231501.

It is a cyclic number.

It is not a de Polignac number, because 1051320731 - 2¹⁰ = 1051319707 is a prime.

It is a super-2 number, since 2×1051320731² = 2210550558860748722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a junction number, because it is equal to n+sod(n) for n = 1051320697 and 1051320706.

It is not an unprimeable number, because it can be changed into a prime (1051320737) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 303095 + ... + 306543.

It is an arithmetic number, because the mean of its divisors is an integer number (71104500).

Almost surely, 2^1051320731 is an apocalyptic number.

1051320731 is a deficient number, since it is larger than the sum of its proper divisors (86351269).

1051320731 is a wasteful number, since it uses less digits than its factorization.

1051320731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3958.

The product of its (nonzero) digits is 630, while the sum is 23.

The square root of 1051320731 is about 32424.0764093598. The cubic root of 1051320731 is about 1016.8223326036.

The spelling of 1051320731 in words is "one billion, fifty-one million, three hundred twenty thousand, seven hundred thirty-one".