139113749 has 4 divisors (see below), whose sum is σ = 142073664. Its totient is φ = 136153836.

The previous prime is 139113739. The next prime is 139113787. The reversal of 139113749 is 947311931.

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.

It is a cyclic number.

It is not a de Polignac number, because 139113749 - 2¹² = 139109653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139113719) 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, 1479887 + ... + 1479980.

It is an arithmetic number, because the mean of its divisors is an integer number (35518416).

Almost surely, 2^139113749 is an apocalyptic number.

It is an amenable number.

139113749 is a deficient number, since it is larger than the sum of its proper divisors (2959915).

139113749 is an equidigital number, since it uses as much as digits as its factorization.

139113749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2959914.

The product of its digits is 20412, while the sum is 38.

The square root of 139113749 is about 11794.6491681610. The cubic root of 139113749 is about 518.1514106960.

The spelling of 139113749 in words is "one hundred thirty-nine million, one hundred thirteen thousand, seven hundred forty-nine".