149778831 has 16 divisors (see below), whose sum is σ = 203040000. Its totient is φ = 98192640.

The previous prime is 149778809. The next prime is 149778841. The reversal of 149778831 is 138877941.

It is not a de Polignac number, because 149778831 - 2⁹ = 149778319 is a prime.

It is a super-2 number, since 2×149778831² = 44867396431453122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (149778841) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 119295 + ... + 120543.

It is an arithmetic number, because the mean of its divisors is an integer number (12690000).

Almost surely, 2^149778831 is an apocalyptic number.

149778831 is a deficient number, since it is larger than the sum of its proper divisors (53261169).

149778831 is a wasteful number, since it uses less digits than its factorization.

149778831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1886.

The product of its digits is 338688, while the sum is 48.

The square root of 149778831 is about 12238.4161965509. The cubic root of 149778831 is about 531.0680148796.

The spelling of 149778831 in words is "one hundred forty-nine million, seven hundred seventy-eight thousand, eight hundred thirty-one".