1351818561 has 16 divisors (see below), whose sum is σ = 1843257600. Its totient is φ = 880967568.

The previous prime is 1351818541. The next prime is 1351818613. The reversal of 1351818561 is 1658181531.

It is not a de Polignac number, because 1351818561 - 2¹⁵ = 1351785793 is a prime.

It is a super-2 number, since 2×1351818561² = 3654826843728221442, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1351818541) 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, 10350 + ... + 53016.

It is an arithmetic number, because the mean of its divisors is an integer number (115203600).

Almost surely, 2^1351818561 is an apocalyptic number.

It is an amenable number.

1351818561 is a deficient number, since it is larger than the sum of its proper divisors (491439039).

1351818561 is a wasteful number, since it uses less digits than its factorization.

1351818561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42908.

The product of its digits is 28800, while the sum is 39.

The square root of 1351818561 is about 36767.0852937787. The cubic root of 1351818561 is about 1105.7054962540.

The spelling of 1351818561 in words is "one billion, three hundred fifty-one million, eight hundred eighteen thousand, five hundred sixty-one".