2051121156531 has 8 divisors (see below), whose sum is σ = 2743455428304. Its totient is φ = 1363100494560.

The previous prime is 2051121156523. The next prime is 2051121156551. The reversal of 2051121156531 is 1356511211502.

It is a happy number.

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

It is not a de Polignac number, because 2051121156531 - 2³ = 2051121156523 is a prime.

It is a super-2 number, since 2×2051121156531² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2051121156492 and 2051121156501.

It is not an unprimeable number, because it can be changed into a prime (2051121156551) 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, 1078401340 + ... + 1078403241.

It is an arithmetic number, because the mean of its divisors is an integer number (342931928538).

Almost surely, 2^{2051121156531} is an apocalyptic number.

2051121156531 is a deficient number, since it is larger than the sum of its proper divisors (692334271773).

2051121156531 is a wasteful number, since it uses less digits than its factorization.

2051121156531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2156804901.

The product of its (nonzero) digits is 9000, while the sum is 33.

The spelling of 2051121156531 in words is "two trillion, fifty-one billion, one hundred twenty-one million, one hundred fifty-six thousand, five hundred thirty-one".