1013556121 has 8 divisors (see below), whose sum is σ = 1092924000. Its totient is φ = 936790560.

The previous prime is 1013556113. The next prime is 1013556127. The reversal of 1013556121 is 1216553101.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1013556121 - 2³ = 1013556113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1013556127) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 649771 + ... + 651328.

It is an arithmetic number, because the mean of its divisors is an integer number (136615500).

Almost surely, 2^1013556121 is an apocalyptic number.

It is an amenable number.

1013556121 is a deficient number, since it is larger than the sum of its proper divisors (79367879).

1013556121 is a wasteful number, since it uses less digits than its factorization.

1013556121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1301159.

The product of its (nonzero) digits is 900, while the sum is 25.

The square root of 1013556121 is about 31836.3961685364. The cubic root of 1013556121 is about 1004.4984406879.

The spelling of 1013556121 in words is "one billion, thirteen million, five hundred fifty-six thousand, one hundred twenty-one".