149415661 has 2 divisors, whose sum is σ = 149415662. Its totient is φ = 149415660.

The previous prime is 149415653. The next prime is 149415667. The reversal of 149415661 is 166514941.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 84290761 + 65124900 = 9181^2 + 8070^2 .

It is a cyclic number.

It is not a de Polignac number, because 149415661 - 2³ = 149415653 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 149415661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (149415667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 74707830 + 74707831.

It is an arithmetic number, because the mean of its divisors is an integer number (74707831).

Almost surely, 2^149415661 is an apocalyptic number.

It is an amenable number.

149415661 is a deficient number, since it is larger than the sum of its proper divisors (1).

149415661 is an equidigital number, since it uses as much as digits as its factorization.

149415661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25920, while the sum is 37.

The square root of 149415661 is about 12223.5698959019. The cubic root of 149415661 is about 530.6384391226.

It can be divided in two parts, 14941 and 5661, that added together give a palindrome (20602).

The spelling of 149415661 in words is "one hundred forty-nine million, four hundred fifteen thousand, six hundred sixty-one".