1013721051 has 32 divisors (see below), whose sum is σ = 1581907968. Its totient is φ = 565391520.

The previous prime is 1013721029. The next prime is 1013721073. The reversal of 1013721051 is 1501273101.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1013721029) and next prime (1013721073).

It is not a de Polignac number, because 1013721051 - 2⁵ = 1013721019 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (1013721011) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 424206 + ... + 426588.

It is an arithmetic number, because the mean of its divisors is an integer number (49434624).

Almost surely, 2^1013721051 is an apocalyptic number.

1013721051 is a deficient number, since it is larger than the sum of its proper divisors (568186917).

1013721051 is a wasteful number, since it uses less digits than its factorization.

1013721051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2871.

The product of its (nonzero) digits is 210, while the sum is 21.

The square root of 1013721051 is about 31838.9863375077. The cubic root of 1013721051 is about 1004.5529230986.

Adding to 1013721051 its reverse (1501273101), we get a palindrome (2514994152).

The spelling of 1013721051 in words is "one billion, thirteen million, seven hundred twenty-one thousand, fifty-one".