149905531 has 2 divisors, whose sum is σ = 149905532. Its totient is φ = 149905530.

The previous prime is 149905499. The next prime is 149905543. The reversal of 149905531 is 135509941.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 149905531 - 2⁵ = 149905499 is a prime.

It is a super-2 number, since 2×149905531² = 44943336448783922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (149905631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 74952765 + 74952766.

It is an arithmetic number, because the mean of its divisors is an integer number (74952766).

Almost surely, 2^149905531 is an apocalyptic number.

149905531 is a deficient number, since it is larger than the sum of its proper divisors (1).

149905531 is an equidigital number, since it uses as much as digits as its factorization.

149905531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24300, while the sum is 37.

The square root of 149905531 is about 12243.5914257215. The cubic root of 149905531 is about 531.2177186198.

The spelling of 149905531 in words is "one hundred forty-nine million, nine hundred five thousand, five hundred thirty-one".