1561371402 has 8 divisors (see below), whose sum is σ = 3122742816. Its totient is φ = 520457132.

The previous prime is 1561371373. The next prime is 1561371403. The reversal of 1561371402 is 2041731651.

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

1561371402 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 1561371402.

It is not an unprimeable number, because it can be changed into a prime (1561371403) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 130114278 + ... + 130114289.

It is an arithmetic number, because the mean of its divisors is an integer number (390342852).

Almost surely, 2^1561371402 is an apocalyptic number.

1561371402 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1561371402 is a wasteful number, since it uses less digits than its factorization.

1561371402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260228572.

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 1561371402 is about 39514.1924123472. The cubic root of 1561371402 is about 1160.1177550891.

The spelling of 1561371402 in words is "one billion, five hundred sixty-one million, three hundred seventy-one thousand, four hundred two".