149378691 has 32 divisors (see below), whose sum is σ = 252412416. Its totient is φ = 76320000.

The previous prime is 149378687. The next prime is 149378693. The reversal of 149378691 is 196873941.

It is a happy number.

149378691 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 149378691 - 2² = 149378687 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 149378691.

It is not an unprimeable number, because it can be changed into a prime (149378693) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8791 + ... + 19391.

It is an arithmetic number, because the mean of its divisors is an integer number (7887888).

Almost surely, 2^149378691 is an apocalyptic number.

149378691 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

149378691 is a deficient number, since it is larger than the sum of its proper divisors (103033725).

149378691 is a wasteful number, since it uses less digits than its factorization.

149378691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10683.

The product of its digits is 326592, while the sum is 48.

The square root of 149378691 is about 12222.0575600019. The cubic root of 149378691 is about 530.5946701245.

The spelling of 149378691 in words is "one hundred forty-nine million, three hundred seventy-eight thousand, six hundred ninety-one".