149220691 has 2 divisors, whose sum is σ = 149220692. Its totient is φ = 149220690.

The previous prime is 149220653. The next prime is 149220703. The reversal of 149220691 is 196022941.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 149220691 - 2¹⁵ = 149187923 is a prime.

It is not a weakly prime, because it can be changed into another prime (149220601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 74610345 + 74610346.

It is an arithmetic number, because the mean of its divisors is an integer number (74610346).

Almost surely, 2^149220691 is an apocalyptic number.

149220691 is a deficient number, since it is larger than the sum of its proper divisors (1).

149220691 is an equidigital number, since it uses as much as digits as its factorization.

149220691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 149220691 is about 12215.5921264587. The cubic root of 149220691 is about 530.4075315794.

The spelling of 149220691 in words is "one hundred forty-nine million, two hundred twenty thousand, six hundred ninety-one".