1461987251 has 2 divisors, whose sum is σ = 1461987252. Its totient is φ = 1461987250.

The previous prime is 1461987227. The next prime is 1461987283. The reversal of 1461987251 is 1527891641.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1461987251 is a prime.

It is not a weakly prime, because it can be changed into another prime (1461987151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 730993625 + 730993626.

It is an arithmetic number, because the mean of its divisors is an integer number (730993626).

Almost surely, 2^1461987251 is an apocalyptic number.

1461987251 is a deficient number, since it is larger than the sum of its proper divisors (1).

1461987251 is an equidigital number, since it uses as much as digits as its factorization.

1461987251 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120960, while the sum is 44.

The square root of 1461987251 is about 38235.9418741058. The cubic root of 1461987251 is about 1134.9616710326.

The spelling of 1461987251 in words is "one billion, four hundred sixty-one million, nine hundred eighty-seven thousand, two hundred fifty-one".