125490649 has 4 divisors (see below), whose sum is σ = 132095440. Its totient is φ = 118885860.

The previous prime is 125490637. The next prime is 125490653. The reversal of 125490649 is 946094521.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 946094521 = 29 ⋅32623949.

It is a cyclic number.

It is not a de Polignac number, because 125490649 - 2⁹ = 125490137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125490619) 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, 3302367 + ... + 3302404.

It is an arithmetic number, because the mean of its divisors is an integer number (33023860).

Almost surely, 2^125490649 is an apocalyptic number.

125490649 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

125490649 is a deficient number, since it is larger than the sum of its proper divisors (6604791).

125490649 is an equidigital number, since it uses as much as digits as its factorization.

125490649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6604790.

The product of its (nonzero) digits is 77760, while the sum is 40.

The square root of 125490649 is about 11202.2608878744. The cubic root of 125490649 is about 500.6533445765.

The spelling of 125490649 in words is "one hundred twenty-five million, four hundred ninety thousand, six hundred forty-nine".