149351781 has 8 divisors (see below), whose sum is σ = 199845504. Its totient is φ = 99212960.

The previous prime is 149351731. The next prime is 149351809. The reversal of 149351781 is 187153941.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 149351781 - 2⁶ = 149351717 is a prime.

It is a super-2 number, since 2×149351781² = 44611908975743922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (149351731) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 87741 + ... + 89426.

It is an arithmetic number, because the mean of its divisors is an integer number (24980688).

Almost surely, 2^149351781 is an apocalyptic number.

It is an amenable number.

149351781 is a deficient number, since it is larger than the sum of its proper divisors (50493723).

149351781 is a wasteful number, since it uses less digits than its factorization.

149351781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177451.

The product of its digits is 30240, while the sum is 39.

The square root of 149351781 is about 12220.9566319499. The cubic root of 149351781 is about 530.5628066774.

The spelling of 149351781 in words is "one hundred forty-nine million, three hundred fifty-one thousand, seven hundred eighty-one".