751381561 has 16 divisors (see below), whose sum is σ = 899596800. Its totient is φ = 613948608.

The previous prime is 751381541. The next prime is 751381567. The reversal of 751381561 is 165183157.

It is not a de Polignac number, because 751381561 - 2²⁹ = 214510649 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 751381561.

It is not an unprimeable number, because it can be changed into a prime (751381567) 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, 7390 + ... + 39463.

It is an arithmetic number, because the mean of its divisors is an integer number (56224800).

Almost surely, 2^751381561 is an apocalyptic number.

It is an amenable number.

751381561 is a deficient number, since it is larger than the sum of its proper divisors (148215239).

751381561 is a wasteful number, since it uses less digits than its factorization.

751381561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46968.

The product of its digits is 25200, while the sum is 37.

The square root of 751381561 is about 27411.3400073765. The cubic root of 751381561 is about 909.1178348664.

The spelling of 751381561 in words is "seven hundred fifty-one million, three hundred eighty-one thousand, five hundred sixty-one".