1461927781 has 2 divisors, whose sum is σ = 1461927782. Its totient is φ = 1461927780.

The previous prime is 1461927763. The next prime is 1461927793. The reversal of 1461927781 is 1877291641.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 853516225 + 608411556 = 29215^2 + 24666^2 .

It is a cyclic number.

It is not a de Polignac number, because 1461927781 - 2⁵ = 1461927749 is a prime.

It is a super-2 number, since 2×1461927781² = 4274465673719167922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1461927581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 730963890 + 730963891.

It is an arithmetic number, because the mean of its divisors is an integer number (730963891).

Almost surely, 2^1461927781 is an apocalyptic number.

It is an amenable number.

1461927781 is a deficient number, since it is larger than the sum of its proper divisors (1).

1461927781 is an equidigital number, since it uses as much as digits as its factorization.

1461927781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 169344, while the sum is 46.

The square root of 1461927781 is about 38235.1641947566. The cubic root of 1461927781 is about 1134.9462816859.

The spelling of 1461927781 in words is "one billion, four hundred sixty-one million, nine hundred twenty-seven thousand, seven hundred eighty-one".