1491616154 has 24 divisors (see below), whose sum is σ = 2638384308. Its totient is φ = 630504000.

The previous prime is 1491616127. The next prime is 1491616163. The reversal of 1491616154 is 4516161941.

It can be written as a sum of positive squares in 2 ways, for example, as 1490346025 + 1270129 = 38605^2 + 1127^2 .

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 97097 + ... + 111404.

Almost surely, 2^1491616154 is an apocalyptic number.

1491616154 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

1491616154 is a deficient number, since it is larger than the sum of its proper divisors (1146768154).

1491616154 is a wasteful number, since it uses less digits than its factorization.

1491616154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208590 (or 208583 counting only the distinct ones).

The product of its digits is 25920, while the sum is 38.

The square root of 1491616154 is about 38621.4468139142. The cubic root of 1491616154 is about 1142.5775661530.

The spelling of 1491616154 in words is "one billion, four hundred ninety-one million, six hundred sixteen thousand, one hundred fifty-four".