149399431 has 4 divisors (see below), whose sum is σ = 151848664. Its totient is φ = 146950200.

The previous prime is 149399389. The next prime is 149399477. The reversal of 149399431 is 134993941.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 134993941 = 431 ⋅313211.

It is a cyclic number.

It is not a de Polignac number, because 149399431 - 2¹⁵ = 149366663 is a prime.

It is a super-2 number, since 2×149399431² = 44640379966247522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (149399231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1224525 + ... + 1224646.

It is an arithmetic number, because the mean of its divisors is an integer number (37962166).

Almost surely, 2^149399431 is an apocalyptic number.

149399431 is a deficient number, since it is larger than the sum of its proper divisors (2449233).

149399431 is an equidigital number, since it uses as much as digits as its factorization.

149399431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2449232.

The product of its digits is 104976, while the sum is 43.

The square root of 149399431 is about 12222.9059965296. The cubic root of 149399431 is about 530.6192252203.

The spelling of 149399431 in words is "one hundred forty-nine million, three hundred ninety-nine thousand, four hundred thirty-one".