1561701461 has 2 divisors, whose sum is σ = 1561701462. Its totient is φ = 1561701460.

The previous prime is 1561701457. The next prime is 1561701611. The reversal of 1561701461 is 1641071651.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1381980625 + 179720836 = 37175^2 + 13406^2 .

It is a cyclic number.

It is not a de Polignac number, because 1561701461 - 2² = 1561701457 is a prime.

It is a super-2 number, since 2×1561701461² = 4877822906579069042, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1561701061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 780850730 + 780850731.

It is an arithmetic number, because the mean of its divisors is an integer number (780850731).

Almost surely, 2^1561701461 is an apocalyptic number.

It is an amenable number.

1561701461 is a deficient number, since it is larger than the sum of its proper divisors (1).

1561701461 is an equidigital number, since it uses as much as digits as its factorization.

1561701461 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5040, while the sum is 32.

The square root of 1561701461 is about 39518.3686530707. The cubic root of 1561701461 is about 1160.1994952670.

The spelling of 1561701461 in words is "one billion, five hundred sixty-one million, seven hundred one thousand, four hundred sixty-one".